diff --git a/contact_graspnet/data.py b/contact_graspnet/data.py
index 7b9a55f..1308296 100644
--- a/contact_graspnet/data.py
+++ b/contact_graspnet/data.py
@@ -301,10 +301,11 @@ def load_available_input_data(p, K=None):
     """
     
     segmap, rgb, depth, pc_full, pc_colors = None, None, None, None, None
+    cam_K = None
 
     if K is not None:
         if isinstance(K,str):
-            cam_K = eval(K)
+            K = eval(K)
         cam_K = np.array(K).reshape(3,3)
 
     if '.np' in p: